*4.6. Mechanical Properties*

The percentages of EB and TS, among other mechanical parameters according to ASTM [58], were assessed using a TA.XT Plus texture analyzer (Stable Micro-Systems, British). A dimension of 1.5 × 10 cm was made from films that had the same thickness. Forced paper was positioned between the two metal grips to support the ends of the film samples. Following machine calibration, the speed was set at 50 mm/min for initial grip separation and 100 mm/min for detection speed. Following the creation of the stress-strain curves, the TS and EB were determined using the following equations:

$$\text{TS(MPa)} = \frac{\text{Maximum extension force}}{\text{Initial crosssectional area}} \times 100\tag{6}$$

$$\text{EB}(\%) = \frac{\text{Film extension ratio}}{\text{Initial length}} \times 100\tag{7}$$
